Rotary pump.



B. LUBBB.-

ROTARY PUMP. ArrIJIoA'Hon FILED vnu. 1o, 190s.

' 967,400. y i Patna Aug.16,191o.

2 suma-SHEET z. L Jf naar' Lorna, or BUrrnLo, NEW Yonx.

ROTARY PUMP'.

i Specification of Letters Patent. Patented Ailg. 16,*1910.

- Application filed December 19, 1908. Serial No. 468,322.

To all whom 'it may concern: i

Be it known that I, BART Lonen, a citizen of the United States, residing at Buffalo, in the county of Erie and State of NewYork,

havev invented certain new and useful IImproveniente 1in Rotary Pumps, of which the following 1s a specification. i

My invention relates to an improved rotary-pump, and the primary obJect of my invention is the production of a simple and .inexpensive pump which will serve admiwhere said springs are located.

llurther objects are, to provide the longitndinal and end edges of said blades with wear-pieces and the casing with openings throu -h which said wear-pieces maybe reinove and to otherwise improve the constructionof the puni with a view of simplifying the saine and increasing itsei'ectiveiiess and durability.

` To these ends the invention consists in the construction, arrangement and combination ofparts to be hereinafter described and particularly pointed out in the subjoined claims. v

Reference is to be had to the accompanying drawings, in which,-

Figure l is a central transverse vertical section of a pump constructed according to my invention. Fig.- 2 is a transverse verticai section taken thro h the pump, on or about line 2-2, Fig. 4. ig. 3 is a horizontal section of the complete piston vtaken on line 3-3, Fig. 1. Fig. d is avertical longitudinal sectionv taken on line fir-4, Fig. 3, with the iston within the casing. Fig. 5 is a detac ed perspective view of one of the piston-blades. Fig. 6 is a perspective view of the' outer portion of one of the end wearpieces of a piston blade. Fig. 7 is a perspective view of a portion of the longitudinal Wear-piece of one of the pistonfblades. Fig. 8 is a longitudinal section through one end of one of the pistornblades, taken on line Fig. l. Fig.v 9 is a perspective view ot one-of the retaining-members for the springs in the ends of the blades.

Referring now to the drawings in detail, like letters of reference refer to` like parts in the several figures.

The reference letter A. designates the casing comprising a cylindrical body-portion B having a base b, and heads or end-Walls C having bearings c. The cylindrical bodyportion. B has the usual inlet D and outlet E and at its ends it has outstanding annular flanges E through which and the'h'eads C, bolts f are passed to fasten said heads to the body-portion. Within said casing a piston G is eccentrically arranged to provide a crescentshaped pumping-chamber G1 having the inlet D at one end thereof and the outlet E at its other end. rlChe piston has an integral stud-shaft 'g atoneend which entersthe bearing in one ofthe heads C and at its other end it has an integral shaft gL which passes lthrough the bearing in the opposite head and isadapted to have a pulley secured thereto whereby the piston is revolved. VA stufling-box H is provided to prevent leakage along the shaft. Said piston, in the particular embodiment'herein shown, has two parallel overlapping blade slide-ways l divided by a narrow wall. and they extend from end to end of the piston body and almost through the saine trans- ,versely Said slideways have in their dis tant walls and at certain points between their ends, lateral substantially semi-circular enlargements z'- which extend from the inner end of the slidefways to the surface of the piston. Piston-blades J are s lidably held in said slide-ways and each has a pair of substantially semi-circular lateral enlargements on its outer side tting into the enlargements vof said slide-ways. Said. blades are bored out from their inner edges to within a short distance of their outer edges at the points where they are enlarged laten' ally to forni pockets K and in these pockets and the enlarged portions ot the slide-ways, Ycoilfspiings L are placed, one of their ends hearing against the inner ends of said pockets and their opposite .ends V,bearing against the inner walls of said slide-ways. By enlarging the blades laterally and boring into them toV forni the pockets ifi, quite powerfulsprings can he used which will act edectively to hold the blades against the cylindrical wall .of the casing and vvhiclfi will not so quickly lose their resiliency and effectiveness. This construction also permits the use of a comparatively pewerfni' 'f unirsi) sini-Es PATENT orricn.

wat

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s r' xgwithout increasing ,the thiclmess lof tie b ades except at the points where the springs are located, and as the-blades are |hollovved out at such points, there is practically no increase in the weight of the same. Furthermore, these advantages are obtained without enlarging the diameter of the piston,and 'Without sacricing any advantages common' in ordinary. pumps of this type. The end edges and the outer longitudinal edge of each blade are grooved, as atv M, and, at the ends, there are pockets N which open into the'end grooves'. In the grooves .Mat the longitudinal edges of the blades,

hard rubber or other wearing-pieces O of A suitable material are held by frlctional contact. Within the .pockets N, coil springs I are held which project into the end grooves, and in the latter spring-retaining members Q are held against which the .outer endsv of v said springs bear. -Said retaining-'members -said wear-pieces are held against endwise movement in the other direction by the cooperating longitudinal wear-piece O. The

adjacent ends ofthe wear-pieces O and S ofeach blade are reduced in width to form shoulders o and s on the respectivepiece's; the shoulders'of-the end wear-pieces acting as stops that bearv againstl the longitudinal wear-pieces. Said end wear pieces arev therefore free to moveagainst the action of' the springs P but not endwise. In order to prevent the retain'-4 ing-members enterl between the outer ends of the stop-pms R and .fthe end walls of the casing when the wearpieces S are removed, the lower ends of said retaining members are bentat a vright-angle, as at g. o

In the heads or end walls ofthe casing,

tv'vo alined and` threaded openings' T. are

formed and sc'rew lugs vt are threaded into said openings an have their inner faces flush with.the inner faces of said vend-walls 'so thatfthe end wear-pieceshave a smooth and unbroken surface to bear against. j Said plugs have peripheral flanges t1 which bear agalnst the outer lsurface of the heads and thus prevent said plugs rejecting vbeyond the inner' surfacesof sai heads. Through the openings T, the wearieces may be removed when worn; the en ieces bemg rst removed', as shown in dottedP lines at the left in Fig. 4, after which the longitudinal wearpieces ,may be driven from their retaining grooves," it being, of course, that lpiston-blade slid the piston must be positioned to bring the Wear pieces in line with the openings T. By means of this construction, the wear-- pieces can be replaced at any time without removing the heads of the casing, which is a very desirable feature of my invention. When inserting the end wear-pieces, the

spring-retaining members provide a smooth yieldingwall against which the inner ends of said wear-pieces are placed and down which they slide until they strike the bent ends of the retaining-member Q; Without said spring retaining-members, the springs I projecting from-the pockets wouldact as obstructions to'the insertion of said wearpieces By the use of the yielding wear-pieces at the ends of the blades a very eective vacuum pump is obtaine Having thus described my invention, what I claim is,; l

l. In a rotary-pump, the combination with a casing comprising a cylindrical Wall and end walls and having an `opening in one of its end walls, of a piston having a pistonblade slidable therem, and a wear-piece removably 'held to the longitudinal edge of said blade and removable from the atter through said opening. e

2. In a rotary-pump, the combination with a casin having openings in opposite end walls, ot a piston having a piston blade slldable therein, and wear-pieces removable from the blade through said openin 3. In a rotary-pump, the com ination with a Casin having `alined openings in opposlte ,end wa ls and means to close said opemngs,

of a piston revoluble in said casing and having a piston blade slidable therein rovided wlth a groove in its longitudinal e ge, and a wear-piece held in said roove and adapted to be removed through either of said openlngs.

4. In a rotary-pump, the combination with a casing having an opening in one of its end walls and a screw-plug closing said opening,l of a revoluble plston in said casing: a

a le in said piston and avmg a removable wear-piece held to one ed e thereof, said weariece being removab e from said piston-bla e through said openin 5. In a rotary-pump, the combination wit a casing having. alinedopenings in its end `walls and means to close said openings of a. piston revoluble in said casing, apiston-blade slidable in said piston and having its outer' longitudinal edge and its end edges provided wit grooves, wearieces in said grooves and removable from the casin through said openings, and springs behin the wear-pieces in the end grooves of said valve.

6. In a rotary-pump, the combination with a casing having alined threaded openings in lts end walls and screw-plu closin said openings, of a piston revolu le in sa1d casing, a springprojected piston-blade slidable 1n said piston and having grooves in its outer longitudinal edge and its end edges and having also pocketsopening intothe grooves in said end edges, coil springs in said pockets and pro'ectlng therefrom, and wear-pieces in the e ge grooves of said blade having reduced overlappin ends and bein removable from said b ade through sald alined openings, the Wear pieces in the grooves formed in the end edges bein held against the ends of the casing by sai springs.

7. In a rotary-pump, the combination with a casing having openlngs in opposite endsV and means to close said openings, of a piston revoluble in said casing and havin blade slide-Ways, piston-blades in said sli e-ways provided at their ends with grooves and pockets opening into v said grooves, coil springs in said pockets and projecting into said grooves, a spring-retainlng mem erin each of said grooves against which the projecting ends of said springs bear, and Wearpieces between said retaining members and the ends of the casing, said wear-pieces being removable from the easing through the openings in the ends thereof.

8. In a rotary-pump, the combination with a easing, of a piston revoluble in said casing and having blade slide-ways, piston-blades in said sllde-ways provided at their ends .with grooves and pockets opening into said grooves, coil springs in said pockets and project-ing into said grooves, a spring retainingmember in each of said grooves against which the projecting ends of said springs bear, stops in said grooves against which the lower ends of said retaining-members bear, and wear-pieces between said retaining-members and the ends of the easing.

In testimony whereof, I have affixed my signature in the presence of two subscribing 'wltnesses BART LOBEE.

Witnesses:

ELLA' C. PLUEom-IAHN, EMIL N EUHART. 

